package com.zdw.test5.utils;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.apache.commons.dbcp.BasicDataSourceFactory;

import javax.sql.DataSource;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

/**
 * Author: Zhang Dongwei
 * Date: 2022/4/3 18:59
 */
public class JdbcUtils_C3P0 {

    private static ComboPooledDataSource dataSource = null;

    static {
        try{
            // 代码版配置 一般不用
//            dataSource = new ComboPooledDataSource();
//            dataSource.setDriverClass();
//            dataSource.setUser();
//            dataSource.setPassword();
//            dataSource.setJdbcUrl();
//
//            dataSource.setMaxPoolSize();
//            dataSource.setMinPoolSize();

            // 创建数据源 工厂模式--》创建对象
            dataSource = new ComboPooledDataSource("MySQL"); // 配置文件写法
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //2.获取连接
    public static Connection getConnection() throws Exception{
        return dataSource.getConnection(); // 从数据源中获取连接
    }
    //3.释放资源
    public static void release(Connection conn, Statement st, ResultSet rs){
        if(rs!=null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if(st!=null){
            try {
                st.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}